氧化还原生物对石门雄黄矿区尾矿砷释放行为研究  

A study of the release behavior of arsenic in tailings of Shimen realgar mining area by redox organisms

作　　者：张明慧[1] 刘璟 ZHANG Ming-hui;LIU Jing(Southwest University of Science and Technology,Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Educa tion,Mianyang 621010,China;Department of Agricultural Resources and Environment,Southwest University,Chongqing 400715,China)

机构地区：[1]固体废物处理与资源化教育部重点实验室西南科技大学,四川绵阳621010 [2]西南大学资源环境学院,重庆400715

出　　处：《岩石矿物学杂志》2020年第2期203-210,共8页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(41772367)。

摘　　要：对石门4处典型不同种类的含砷尾矿进行样品采集,并采用1种氧化菌(氧化亚铁硫杆菌,Thiobacillus ferrooxidans,简称T.f)和2种还原菌(硫酸盐还原菌,sulfate reducing bacteria,简称SR;嗜酸铁还原菌,Acidiphilium cryptum JF-5,简称JF-5)分别对其进行作用,据此研究生物还原和氧化条件下原生和次生含砷矿物的释砷情况,进而确定潜在的释砷风险。ICP-OES定量分析显示,3种细菌作用后,雄黄矿和雌黄矿的砷释出浓度都不断升高。168 h氧化菌T.f作用后的砷释出顺序为雌黄矿>淋滤液次生含砷矿物>雄黄矿>含砷夹矸尾矿。LC-AFS原子荧光分析释出液砷形态结果表明:①T.f作用后,雄黄矿和雌黄矿表现出非常明显的差异;1.5 h作用后4种含砷矿物释放As(Ⅴ)的顺序为含砷夹矸尾矿>雄黄矿>淋滤液次生含砷矿物>雌黄矿;②2种还原菌作用后,SR更能促进雌黄矿释放的As(Ⅲ),其释放量是JF-5的2倍;雌黄矿释出As(Ⅲ)在168 h达到20.64 mg/L(SR)和9.54 mg/L(JF-5)。96 h SR作用后4种含砷矿物释放As(Ⅲ)的顺序为雌黄矿>淋滤液次生含砷矿物>含砷夹矸尾矿>雄黄矿。96 h JF-5作用后4种含砷矿物释放As(Ⅲ)的顺序为雄黄矿>雌黄矿>含砷夹矸尾矿>淋滤液次生含砷矿物。Collecting four different types of arsenic-containing minerals in Shimen realgar mining area,using Thiobacillus ferrooxidans(T.f),sulfate reducing bacteria(SR)and Acidiphilium cryptum JF-5(JF-5)to investigate the release of arsenic from primary and secondary arsenic-containing minerals under biological reduction and oxidation conditions to determine the potential risk of arsenic release.Quantitative analysis by ICP-OES showed that the concentration of arsenic in both realgar tailing and orpiment tailing was increasing under the action of the above T.f,SR and JF-5.Arsenic released at 168 h under the action of T.f:orpiment tailing>leachate secondary arsenic-containing tailing>realgar tailing>arsenic containing clip rock tailing.The results of LC-AFS atomic fluorescence spectrometry release showed that:①Under the action of T.f,realgar tailing and orpiment tailing showed very obvious differences;after 1.5 h,the order of releasing As(V)for four arsenic-containing minerals is:arsenic containing clip rock tailing>realgar tailing>leachate secondary arsenic-containing tailing>orpiment tailing;②Under the action of JF-5 and SR,SR can promote the release of As(Ⅲ)from the orpiment tailing,which is twice as much as JF-5;the orpiment tailing releases As(Ⅲ)reached to 20.64 mg/L(SR)and 9.54 mg/L(JF-5)at 168 h.The order of release of As(Ⅲ)from four arsenic-containing minerals under the action of SR at 96 h was:orpiment tailing>leachate secondary arsenic-containing tailing>arsenic containing clip rock tailing>realgar tailing;the order of release of As(III)by four arsenic-containing minerals after 96 h of action of JF-5 is realgar tailing>orpiment tailing>arsenic containing clip rock tailing>leachate secondary arsenic-containing tailing.

关 键 词：雄黄矿 砷释放 生物氧化 生物还原 

分 类 号：P578.2[天文地球—矿物学] P579[天文地球—地质学]